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Message ID: 11472     Entry time: Thu Jul 30 19:12:52 2015
Author: Ignacio 
Type: Update 
Category: IOO 
Subject: YAW and PIT WFS Wiener filtering 

Rana pointed out that another way to mitigate seismic motion at in the mode cleaner would be to look at the YAW and PITCH output  channels of the WFS sensors that control the angular alignment of the mode cleaner. 

I downloaded 45 mins of data from the following two channels:

C1:IOO-WFS1_YAW_OUT_DQ

C1:IOO-WFS1_PIT_OUT_DQ

And did some quick offline Wiener filtering with no preweighting, the results are shown in the PSD's below,

and

I'm quite surprised at the Wiener subtraction obtained for the YAW signal, it required no preweighting and there is about an order of magnitude improvement in our region of interest, 1-3 Hz. The PIT channel didn't do so bad either.

 

Attachment 1: YAW.png  88 kB  | Hide | Hide all
YAW.png
Attachment 2: PIT.png  86 kB  | Hide | Hide all
PIT.png
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